assigning fixed memory regions to variables that will be modified

raghav_sarma — Tue, 19 Dec 2006 19:18:28 GMT

Hi again,

How can you assign a fixed memory region within RAM to a variable that will be modified i.e. that does not have the qualifier const?

e.g.

#pragma CONST_SEG CALIBRATION

Int16 Sb10_Constant8 ;

In this case this variable is not assigned an address in the RAM memory region CALIBRATION. When I add the "const" identifier, then this variable is put in the correct memory region, but I get an error when I try to modify it.

#pragma CONST_SEG CALIBRATION

const Int16 Sb10_Constant8 ;

=> Sb10_Constant8 is assigned the correct location, but elsewhere in the program the statement below gives me an errror - "modifiable value expected".

Sb10_Constant8 = Sb10_Constant8_ROM;

How can I get round this problem?

Raghav

Re: assigning fixed memory regions to variables that will be modified

Lundin — Tue, 19 Dec 2006 21:35:34 GMT

There is a reason it is called CONST_SEG: it only affects constant variables. For non-constant variables, you use DATA_SEG. It works in the same manner in the .prm file.

topic Re: assigning fixed memory regions to variables that will be modified in S12 / MagniV Microcontrollers

assigning fixed memory regions to variables that will be modified

Re: assigning fixed memory regions to variables that will be modified